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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Jiri Kosina" <jikos@kernel.org>, "Jürgen Groß" <jgross@suse.com>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Michal Hocko" <mhocko@suse.com>,
	"Naoya Horiguchi" <n-horiguchi@ah.jp.nec.com>,
	"Michael Ellerman" <mpe@ellerman.id.au>,
	"Will Deacon" <will.deacon@arm.com>
Subject: Re: Access to non-RAM pages
Date: Sun, 2 Sep 2018 18:38:10 -0700	[thread overview]
Message-ID: <CA+55aFz_Kbu2PDjqvmgqCFcFSsoRPD=a8vAtPY=--t61X454Jg@mail.gmail.com> (raw)
In-Reply-To: <fd389fc96692e38c318f14f0da840cdecda8fbe5.camel@kernel.crashing.org>

On Sun, Sep 2, 2018 at 6:32 PM Benjamin Herrenschmidt
<benh@kernel.crashing.org> wrote:
>
> Also, if we cross page boundaries with those guys then we have a bigger
> problem no ? we could fall off a vmalloc page into the nether or into
> an ioremap mapping no ?

It's not used for vmalloc stuff. It's just regular kmalloc().

So it can cross pages, and it can fall off the end of memory, but it
can't do random stuff.

               Linus

  reply	other threads:[~2018-09-03  1:38 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-29 12:10 Access to non-RAM pages Juergen Gross
2018-08-31 21:18 ` Jiri Kosina
2018-09-01 10:47   ` Juergen Gross
2018-09-01 17:13     ` Al Viro
2018-09-01 21:48       ` Jiri Kosina
2018-09-01 17:27   ` Linus Torvalds
2018-09-01 18:06     ` Linus Torvalds
2018-09-03  0:48       ` Benjamin Herrenschmidt
2018-09-03  0:55         ` Benjamin Herrenschmidt
2018-09-03  1:38           ` Linus Torvalds [this message]
2018-09-03  1:42             ` Linus Torvalds
2018-09-03  2:00               ` Benjamin Herrenschmidt
2018-09-03  2:10                 ` Linus Torvalds
2018-09-03  2:25                   ` Benjamin Herrenschmidt
2018-09-03  2:47                     ` Linus Torvalds
2018-09-03  2:52                       ` Linus Torvalds
2018-09-03  3:44                         ` Benjamin Herrenschmidt
2018-09-03  5:08                   ` Juergen Gross
2018-09-03  6:05                   ` Jiri Kosina
2018-09-03 10:36                   ` Will Deacon
2018-09-03  1:44             ` Benjamin Herrenschmidt
2018-09-03  1:46             ` Benjamin Herrenschmidt

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